1 wsg oct 2005 mdss stakeholder meeting boulder, co october 21, 2005 road weather information system...
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MDSS Stakeholder MeetingBoulder, CO
October 21, 2005
Road Weather Information SystemEnvironmental Sensor Station
Siting Guidelines
Ed BosellyWeather Solutions Group
Olympia, WAwith help from
Paul Pisano, FHWA and Lee Smithson, SICOP
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AcknowledgementsAcknowledgements
• SAIC: – John Manfredi, Tom Walters, Greg Wilke,
Tom Incrocci
• Meridian Environmental Technology, Inc.– Leon Osborne, Bob Hart
• T & S Diversified Inc.– Tom Schmitt
• Many Interviewees
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Defines RWISDefines RWIS
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Purpose of the ProjectPurpose of the Project
• Provide information on the selection & installation of environmental sensor station (ESS) equipment & instrumentation
• Help ensure that the data adequately support the specified purposes of the observing site
• Educate on the importance of participating in the greater community and on issues such as the need for accurate metadata
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RWIS/ESS RWIS/ESS ApplicationsApplications
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Siting Guidelines CharacteristicsSiting Guidelines Characteristics
• Provide siting criteria that satisfy as many road weather monitoring, detection, & prediction requirements as possible
• Criteria are based on an analysis of other published research & interviews with state DOT experts, equipment suppliers & consultants
• Guidelines are a set of recommendations & are not mandates or standards
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ESS Sensor CategoriesESS Sensor Categories
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Planning the ESS NetworkPlanning the ESS Network
• How will the road weather information be used, and who will use it?– Will the ESS be used to measure a site-specific
condition or provide information that represents conditions across a general area?
• What needs to be measured at each installation?
• What other sources of weather and pavement data are available to share and improve the availability of data to other partner agencies
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Examples of ESS SensorsExamples of ESS Sensors
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Regional Site RequirementsRegional Site Requirements
• Support broad, real-time monitoring of weather and road conditions
• Provide data to improve the accuracy of surface transportation specific forecasts
• Provide ground truth to evaluate accuracy
• Anticipate changes in road weather from upstream locations
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Local Site RequirementsLocal Site Requirements
• Observations used to assist in issuing advisories & short term forecasting
• Observed conditions may be locally worse, but may be representative of other similar segments or structures
• Highlights specific problems, typically called trouble spots
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Additional Siting ToolsAdditional Siting Tools
• Thermal mapping– Better defines thermal characteristics– Help identify similar areas– Optimize the number of ESS to be installed
• Portable sensor systems– Help identify potential permanent ESS sites– Do not include sensors requiring implanting
in/below pavement
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Typical Locations of Tower-Based Typical Locations of Tower-Based SensorsSensors
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ESS Location Relative to RoadwayESS Location Relative to Roadway
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Other ConsiderationsOther Considerations
• Electrical power availability
• Communications availability
• Roadside environment
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Typical Pavement Sensor SitingTypical Pavement Sensor Siting
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Optional ConsiderationsOptional Considerations
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Aside (mine) – Also Consider:Aside (mine) – Also Consider:
• Installing remote sensor systems in the pavement using wireless communications to the ESS RPU
• Repeater sites to solve communications problems– Can solve line-of-site problems– Can get data into a backbone system
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Siting MetadataSiting Metadata
• Metadata: “data about data”• Metadata are used to document the
characteristics of each sensor and its siting to provide users an understanding of what the sensor data really represent
• Standards have been developed for some geospatial metadata, but not for RWIS ESS location and sensor metadata
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ConclusionConclusion• Collection of road weather information can provide
decision support to transportation managers & contribute to more accurate road weather forecasts
• Siting recommendations are designed to satisfy as many road weather monitoring, detecting and predicting requirements as possible
• Siting recommendations encourage uniformity in siting, application and participation in the greater community
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Conclusion (cont.)Conclusion (cont.)
• Siting decisions are best made by a team of transportation operations, road maintenance, and weather experts.
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Recommendation (Mine)Recommendation (Mine)
Hire a weather expert experienced in RWIS ESS siting
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Questions?Questions?